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Topic: Please help me find a motor and speed controller. (Read 754 times) previous topic - next topic

masterwigglestin

I am working on a project which will need an as small as possible DC motor which will spin up to 2500 RPM with a little bit of weight on it, maybe a pound. I don't know a ton about how to pick out the right motor and will need a speed controller too so that I can control this setup with my Arduino. Thanks.

MarkT

Motor load is a torque, not a weight - you'll have to explain more about the mechanics of the
situation or work out the torque yourself.  If none of this means anything then just provide
more information about the setup please?!
[ I won't respond to messages, use the forum please ]

masterwigglestin

It is for a centrifuge. I am planning on attaching a plastic disc directly to the motor shaft.

JimboZA

It's aaaaaages since I did this kind of calculation, but the torque T required depends on the Moment of Inertia I of the disk and the required acceleration a, and :

T = Ia

The Moment of Inertia of a disk on mass m and radius r is

I= mr2 / 2

(Let's check those units....

units of I will be kg m2
units of a are rad / s2 or just 1/s2

So units of T are kg m2 / s2

(Which is right since T=Fd and units of force at kg m / s2) )

I think... it's been a long time, as I say

No PMs for help please. Not active on this forum any more.

encryptor

I believe you'll want to know the horsepower of the motor. 
peace*&^

JimboZA


I believe you'll want to know the horsepower of the motor. 


Power in Watts is just P = Tw where w (lower case omega) = rotation speed in rads / sec

No PMs for help please. Not active on this forum any more.

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